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WaterQ �li Site Assessment Method <br /> For each constituent: D RAFT <br /> 10 = Site ground water concentrations (µg/1) <br /> = Background'ground water concentrations (gg/1) <br /> = Numerical water quality limits protective of beneficial uses <br /> ® = The higher of O and (I for each constituent` <br /> =Contaminated soil WET extract concentrations (gg/l extract) <br /> © = Contaminated soil potential leachate concentrations (µg/l) _ x 106 <br /> 0 = Background'soil WET extract concentrations (µg/l extract) <br /> = Attenuation°that would be required to protect background water quality = © + <br /> O = Attenuation that would be required to protect beneficial uses = © � <br /> Perform the following comparisons in order. <br /> Ground Water: <br /> If (1) <_ (, then no water quality impact has yet occurred. <br /> If(Z < T < ®, then water quality has been impacted (degradation has occurred)but <br /> beneficial uses have not yet been affected. <br /> if(1) ? ®, then beneficial uses have been affected (pollution has occurred). <br /> Soils: <br /> If© <_(2), then contaminated soils pose no threat to water quality;STOP. <br /> If(5) <_(2), then contaminated soils pose no threat to water quality;STOP. <br /> If e > ©, then calculate ® above. Is this degree of attenuation° available at <br /> the site? If not, contaminated soils threaten ground water quality <br /> (threat of degradation). <br /> If© <_ ®, then contaminated soils pose no threat to beneficial uses; STOP. <br /> If© > ®, then calculate (9) above. Is this degree of attenuation' available at the <br /> site? If not, contaminated soils threaten beneficial uses of ground water <br /> (threat of pollution). <br /> ' Background=out of the influence of waste management activities(per Chapter 15,Article 5). <br /> ` Regional Board does not expect discharger to improve on background conditions(see Resolution 9249). <br /> b Dilution caused by the WET(50 grams soil in 500 milliliters of extract solution). <br /> d Within clean soil between the base of contaminated soil and the highest elevation of ground water. <br /> )91 10/2/92 <br />